[Theme: Customizr] Center the credits

Hi, I wrote this to center the credits below the footer

/* START OF center credits  */
.entry-header{height:97px;}
.span6.credits > p {
  margin-left: 370px;

}
.row-fluid .span6 {
    width: 60%;
}
/* end OF center credits  */

It works but now the credits line wraps when I resize the browser window, like it’s not responsive.
Any suggestion ? Thanks